Double-acting hydraulically-controlled pump



Oct. 15, 1929. P. E. J. MENGIN DOUBLE ACTING HYDRAULICALLY CQNTROLLED PUMP- Patented Oct. l5, 1,929 i :PIERRE EMILE JEEME MENGIN, E MONTARGIS', FRANCE DOUBLE-UTING' HYDRAULICALLY-CONTROLLED IP'UMIP Application filed April 5, 1927, Serial No My invention has for its obj ect an improved double acting hydraulicallyfcontrolled suction and pressure built pumps of this type wherein the pump piston is disposed ve rtically and is borne by a rod the ends of which act as plunging pistons A inside vtwo receiving cylinders connected throughA suitable pipings with the two chambers of a double acting press, which gives these plunging pistons and cons piston ypump which is secured t ternating movement.

A form of execution of such a pump comprises two suction and two pressure pipes for i5 the liquid to be pumped. these pipes leading each to one of the chambers of the pump and disposed laterally with reference thereto, the corresponding valves being disposed respec- .tively in a suction and a pressure valve box` 2o both boxes being disposed in the axis of the pump.

In the improved pump which is described hereinbelow the lateral suction and pressure tubes are disposed in alignment one with the other. v

This arrangement shows the following advantages: The flanges at the extremities of the pump body where these pipes end require only in this case one single channel which allows the corresponding v chamber of the pump to communicate with the suction and o them an althe pressure sides.

Br reason of the reciprocating movement of t e piston, the liquid columns in the pressure and suction tubes are submitted periodiy cally to water hammer effects at each corresponding stoppage of the piston. .Thanks to my improved arrangement allowing the twc liquid columns to be in alignment the vis viva of these water hammer effects isnoglongerA lost;`the moving pressure column instead of stopping will suck the suction column whereas the movingsuction column vinstead of stoping will urge forward the pressure column.

he detrimental action of the water hammer pump. I have already..

equently the 181,213, and inIran-ce February 8, 192'?.`

effects on the mized.

Lastly this arrangement of the suction and pressure tubes in alignment allows a general symmetrical disposition to be given to the pump with reference to its axis so that the stresses transmitted to the pump device b the controlling pressand by the pressure an suction tubes will remain constantly symmetrical. These stresses will therefore appear in equilibrium whereby'the pump when working will not be submitted to any motion or vibration. The mounting of these several parts may be executed in a very advantageous manner by using for the lateral suction and pressure tubes thin metal tubes either of steel or of a more malleable metal such as brass, the said tubes being secured by chuclring in the end flanges of the pump body and in the valve boxes. This manner of securing them Vprovides perfect watertightness and consid `arable resistance against the wrenching out of the tubes. The pumpv system obtained in this manner is absolutely rigid and of a very simple construction whereby the Asize of the cross section of the system -can be 'considerably reduced and the pump can be lowered into very narrow boredshafts. The reason is that by connecting as stated the pump body with the valve boxes by means of lateral pipes, all the devices such as struts, stays and the like which were thought up till now necessary for connecting these parts are done away with. Besides the comparatively important flexibility of these lateral pipes makes the pump system less liable to be broken. Y' l f The number of lateral suction and pressure pipes disposed symmetricallyI and in alignment one with reference to the other is chosen so as to give the total liquid section required by the output ofthe pump; the rigidity of th arrangement increases with the number of pipes. My invention provides also, 1n a pump of the aforesaid type, for the particular arrangeparts of the pump is thus mini' on a rod' 5 the ltwo ends 8 of which act 4as. .plunging pistons in two small cy1inders9 and ment of certain parts thereof as will be described hereinafter.

,B way of example, I have described hereinbe ow and shown on appended drawings'a Aform of execution of a pump according to my invention: 'o

Fig. l is a front view partly sectional,

Fig. 2-shows in detail the piston ofthe Pumps Fig. 3 shows a modified form ,of the lcy`lin der of the receiving press for pumps of large diameter.. l v

vFigs.` 4and 5 are a partly sectional front view and plan view of a valve.

`The pump body is closed at its upper part by a flange or cover 2 and at its lower part by a flange 3. -It comprises a piston 4 mountedv 10; the upper cylinder 9 and-the lower cylinder 10 communicate respectively through the tube-openings 11 and 12 and corresponding pipes not shown with the two chambers of a double acting hydraulic press not shown which is disposed at the point wherefrom the pump is to be hydraulically actuated.

The double acting controlling press may be constituted for inst-ance by two opposed bodies wherein two plunging pistons secured one to the other are adapted to move. There isithus provided in the two cylinders 9 and 10 alternatingly a pressure and a suction of the liquidwhereby the rod 5 and the piston 4 are given a reciprocating motion.

The top chamber 13 of thel pump body 1 is connected through the opening 14 provided 1n the flange or cover 2 with the suction pipe 15 and the pressure pipe 16. In a similar manner the lower chamber 17 of the pump body is connected with the suction pipe 18 and the pressure pipe 19. The two suction pipes 15 and 18 lead to the suction box 20 wherein is disposed a valve such as 21 at the end of each pipe. This box 20 communicates through an opening with a. pipe plunging in the liquid 4to be pumped. In a similar manner the pressure pines 16 and 19 are connected with a pressure vadve box 22 containing. for each pipe a valve such as 23 and the top of which is connected with the pressure pipe not shown.

As shown on the drawings, the tubes 15 and 16 are disposed on the cover 2 so as 4to be in alignment .one with the other. Similarly the tubes 18 and 19 are disposed on the cover 3 so as to be in alignment one with the other.

The ipes 15 and 16 on one hand and 18 and 19,011l t e other are ldisposed on either side of the pump body and in the central pla-ne thereof.

This aligned symmetrical arrangement of the lat-eral suction and pressure tubes provides the abovementioned advantages consisting in that the covers 2, 3 bears each only one canal such as 14, that the water-hammer Itheir manner of/bein .secured to the cover such as 2 and the valve box'such as 22 in the following manner. The tube is in thin metal, for instance of steel or brass ,the part which is to receive its end for instance the -iiange 2 shows a groove 24 wherein the tube is driven by means of a chuck. This connecting arrangement ensures excellent watertightness and a great` resistance against wrenching out. It obviates the need of any other connectionbetween the pump body 1 and the suction and pressure v alveboxes 2O and 22. The pump arrangement is thus very compact and takes up laterally very little room. However the lateral pipes and assembled gives Athe pump a certain elasticity which makes it less liable to be broken. To provide a good watertightness for the piston 4, its packin comprises two leather cups 25, 26 (Fig. 2) ield between two plates 27, 28 connectedby bolts 29 and secured to the collar 30 ofthe piston rod 5 by means of a nut 31 passing round the rod and screwed into one of the 4plates, 28 for instance. In order to prevent undesired movements of the leather cups 25," 26 principally during the pressure strokes, a thin disc 32 is inserted between the two cups. A

In the apparatus shown on Fig. 1 the driving pistons 8 are plunging pistons formed by the rod 5 of the pump piston 4. This rod is full or hollow, in which latter case it is closed by a threaded plug. The end of the piston may be hollowed out at 34, the hollowed out portion being provided at its basis with a series of peripheral apertures 35. The watertightness of the plunging piston is ensured by the leather cup 36. When the said piston arrives at the end of its driving stroke the holes 35 pass beyond the leather cup 36 so that the play existing at 37 in the guiding passage of the plunging piston allows these apertures to make the chamber under pressure 38 com.

munieate with the top chamber 13 of the of execution of these pistons shown on Fig.

3 comprises a piston 40015 the ordinary type provided with a packing cup 41 of leather or other material and borne by the rod 39 of the piston 4 which has a comparatively small dia-meter. The driving `cylinder 42 is provided with an inner easily replaceable-sleeve 43 of suitable metal. This sleeve is provided at its top end with a seriesjot small peripheral apertures 44 which allow when the cup 41 has passed beyond them the chamber 45 of this driving cylinder to communicate with the chamber 17 of the pump body 1 throu h a chamber 46 the diameter of which is slig tly superior to that of the chamber 45, the top of the sleeve 43 with its apertures 44 being disposed inside the said chamber 46.

The ends of the driving pistons such as 8 (Fig. l) `are preferably provided with a A tapped hole 47. When the pump is taken to pieces, a rod showing a terminal thread may be engaged into this hole after passing through the corresponding cylinder 9; the

`piston 4 and the rod 5 may thus be lifted whereby the lower part of the apparatus (lower driving cylinder 10 and casing 1) can be more easily removed.

Each valve comprises (Figs. 4 and 5) a seat 48 secured between two ]oined parts of the valve box. This seat shows a circular opening. 49. In this opening are left arms 50, 51, 52, 53 the centre ot which supports an upwardly directed stem' 54. This stem serves to guide the valve proper constituted by a disc 55 of slightly yielding material such as hard rubber, leather, ibre disposed round the stem 54 and held in position by the sliding washer 56 pressed down by the spiral spring 57, this spring being held in its turn by a cupv 58 secured by a pin 59 passing through the guiding stem 54 and disposed in a recess of the outer surface of the cap 58.

The radial arms 50, 51, 52, 53' are not Hush with the top surface of the seat 48 of the valve 55. l

This arrangement provides a very large passage 49 for the liquid and t-he valve 55 bears on a regular circular seat of large surtace so that it can rotate round the stem 54 without its wear of deformation being ever detrimental to its watertightness.

The suction and pressure valve boxes 20 and 22 are not symmetrical; the lower part of each of them is less high than the valve guiding stem which is to be disposed in the top part. Thereby no faulty inverted mounting of the valves in their boxesneed to be feared.

What I claim is:

1. In a double acting hydraulically controlled pumping apparatus comprising a pump`-body, a reciprocating piston adapted to move therein and hydraulicmeans acting on the ends of the piston rod and adapted to give latter a reciprocating movement, the combination of two couples of two aligned straight pipes having a uniform section throughout their length and opening without restriction one into the other, a lateral opening being provided between the adjacent ends of the pipes of each couple of pipes, means whereby each end of the pump body is in direct and permanent communication with the opening in one of the couples of pipes and a suction valve box and a pressure valve box respectively in connection with one pipe A of each couple of pipes. f

2. y-In a double acting hydraulically controlled pum-ping apparatus comprising a pump body, a reciprocating piston adapted to move therein and hydraulic means acting on the ends of the piston rod and adapted to givev latter a reciprocating movement, the combination of two couples of two aligned straight pipes independent of the pump body, disposed symmetrically one wit reference to the other, having a uniform section throughout their length and openingwithout restriction one into the other, a lateral opening being provided between adjacent ends ofthe pipes of each couple of pipes, a substantially T-shaped duct secured to each end ofthe pump body and to each pipe of one of the couples of pipe for ensuring unrestricted communication between the pipes of this couple together with direct and permanent connection with the corresponding end of the pump body and a suction valve box and a pressure valve box both independent of the pump body respectively in connection with oneK pipe of. each couple of pipes.

3. In a double acting hydraulically controlled pumping apparat-us comprising a -pump body, a reciprocating piston adapted I body, disposed symmetrically one with reference to the other, having a uniform section throughout their length and opening without restriction one into the other, a lateral opening being .provided between adjacent ends of the pipes of each couple of pipes, a substantially T-shaped duct secured to each end of the pump body and punched over the end of each pipe of one of the couples of pipe for ensuring unrestricted communication between the pipes of this couple together with direct and permanent connection with the corresponding end of the pump body, a suction valve box and a pressure valve box both independent of the pump body and covers secured over, each valve seat of each box and punched over the end 'of the corresponding p1pe. V

4. In a double acting pumping apparatus los Cil

yvided with apertures providing a communication with the pump body, said apertures being uneovered by the auxiliary pistons at the end of their driving stroke.

In testimony whereof I aiix my signature.

PIERRE EMILE JRME MENGIN. 

